DPL 5.0.1 Change History Depth Dialog Bug

This is with DPL on macOS 11.6.1 on iMac 2019

When I change history depth settings, I get a popup, that cannot be acknowledged.
Neither of the options will close the popup.

When DPL is quit, the new value is stored and appears to be effective.

I have not the problem on my side …
You are on M1 or intel ?

…on both, but the screenshot is from an Intel iMac 2019 (first line of OP)